參數(shù)資料
型號: HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 57/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
57
Prescalers
The MCU has the following two prescalers, S and W.
The prescalers operating conditions are listed in table 23, and the prescalers output supply is shown in
figure 39. The timers A–D input clocks except external events and the serial transmit clock except the
external clock are selected from the prescaler outputs, depending on corresponding mode registers.
Prescaler Operation
Prescaler S:
11-bit counter that inputs a system clock signal. After being reset to $000 by MCU reset,
prescaler S divides the system clock. Prescaler S keeps counting, except in watch and stop modes and at
MCU reset.
Prescaler W:
Five-bit counter that inputs the X1 input clock signal (32-kHz crystal oscillation) divided by
eight. After being reset to $00 by MCU reset, prescaler W divides the input clock. Prescaler W can be
reset by software.
Table 23 Prescaler Operating Conditions
Prescaler
Input Clock
Reset Conditions
Stop Conditions
Prescaler S
System clock (in active and standby mode),
Subsystem clock (in subactive mode)
MCU reset
MCU reset,
stop mode,
watch mode
Prescaler W
32-kHz crystal oscillation
MCU reset, software
MCU reset,
stop mode
Subsystem
clock
Prescaler W
System
clock
Prescaler S
Clock
selector
Timer A
Timer B
Timer C
Timer D
Serial
interface 1
Serial
interface 2
f
X
/8
f
X
/4 or f
X
/8
Figure 39 Prescaler Output Supply
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